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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7aadce94c60a3f2f46062b7d4ba77e1f967ae7e8dd143cc985a2106e80c879' 
  AND token = 'rCkj2Ir8+STnz1ANV3mnA4zymsDpXrPqAaqrwIc1uLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}